Silane functional binder with thiourethane structure

摘要

The invention relates to a method for producing polyurethanes containing silane groups by reacting at least A) a composition containing a) one or more compounds containing isocyanate and silane groups of general formula (I) and b) <=1 percent by weight, relative to the total mass of composition A), one or more monomeric diisocyanates with aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of general formula (II), where R1, R2 and R3 are the same or different radicals and respectively indicate a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical with up to 18 carbon atoms, which can contain optionally up to 3 heteroatoms from the series oxygen, sulphur, nitrogen, X is a linear or branched organic radical with at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical with 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical with 6 to 18 carbon atoms, with B) an at least difunctional polyol with a numerically average molecular weight Mn of 62 to 22000 g/mol, preferably 90 to 12000 g/mol, while maintaining an equivalent ratio of isocyanate groups to hydroxyl groups of 0.7:1 to 1.2:1. The invention further relates to the products which can be obtained using the method according to the invention. Moreover, the invention relates to the use of the products which can be obtained using the method according to the invention as starting components in the production of cross-linkable binders, varnish, and raw materials for sealants or adhesives.

主权项

1. A process for preparing polyurethanes containing silane groups, comprising reacting at least
A) a composition containing
a) a compound of the general formula (I) containing one or more isocyanate and silane groups  and
b) ≦1% by weight, based on the total mass of composition A), of one or more monomeric diisocyanate having aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of the general formula (II)
OCN—Y—NCO  (II)  where
R1, R2 and R3 are identical or different radicals and each is a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic radical or an optionally substituted aromatic or araliphatic radical having up to 18 carbon atoms, which may optionally contain up to 3 heteroatoms from the group of oxygen, sulfur, nitrogen,X is a linear or branched organic radical having at least 2 carbon atoms andY is a linear or branched, aliphatic or cycloaliphatic radical having 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radical having 6 to 18 carbon atoms, with B) an at least difunctional polyol having a number-average molecular weight Mn of 62 to 22 000 g/mol, preferably 90 to 12 000 g/mol, while maintaining a ratio of equivalents of isocyanate groups to hydroxyl groups of 0.7:1 to 1.2:1.